Over the past months, I've been building Genesis DB - an event-sourcing database engine designed around simplicity and and real-world usability.

While working on it, I needed a clean, TypeScript-native CQRS framework that would let me model commands, events, and projections without being tied to a specific backend.

That's how CQRSKit was born.

CQRSKit is a lightweight TypeScript framework for CQRS (Command Query Responsibility Segregation) and Event Sourcing, built with modularity in mind. It ships with a minimal core and allows you to plug in your own database adapter whether that's Genesis DB, Postgres, MySQL, or a custom store.

Highlights:

- TypeScript-first design: Strong typing for commands, events, and handlers

- Event Sourcing support: Append-only event streams and replay capability

- Pluggable persistence layer: Bring your own adapter via a simple interface

- Separation of concerns: Clean command and query boundaries

- Lightweight by design: Zero magic, just predictable behavior

npm install cqrskit

Docs & examples: https://npmjs.com/package/cqrskit

Infos about Genesis DB: https://www.genesisdb.io

I'd love feedback from developers using CQRS or Event Sourcing in production:

What do you think about a pluggable-adapter approach?

Would you prefer stricter conventions or more flexibility in handler definitions?

Thanks for reading!